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Why do waterfalls retreat?

Waterfalls are an erosional landform which are formed when a band of soft rock is overlaid with a band of hard rock. Over time, the soft rock is eroded through a combination of hydraulic action* and abrasion...
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Answered by Beth C. • Geography tutor
9828 Views

The value of a new car is £18,000. The value of the car decreases by 25% in the first year and 12% in each of the next 4 years. Work out the value of the car after 5 years?

The initial value of the car is 18000. To subtract 25% of 18000 one must times 18000 by 0.75 which equals 13500. Next, one must times 13500 by 0.88 to the power of 4 which equals 8095.89 to 2 decimal places ...
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Answered by Lottie B. • Maths tutor
6005 Views

Marcin buys 7 rulers and 15 crayons for £7. A ruler costs 12p more than a crayon. Find the cost of one crayon.

To solve this problem we're going to use an equation. First let's write down the information that we do know.Let's use (r) for ruler and (c) for crayon. So 7 rulers and 15 crayons cost £7 (or 700 pennies) --...
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Answered by Emily D. • Maths tutor
10892 Views

Find the equation of the line that passes through the (4,6) and (9,-4)

First write out the general equation, y = mx + c where m = gradient and c = the Y-interceptFind the gradient m= change in y/change in xM= (-4,-6)/(9-4) = (-10)/(5) = -2Find c by substituting in either of the...
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Answered by Brooke F. • Maths tutor
3092 Views

Expand 2a (4 + a)

To expand is just to multiply out. We will multiply everything inside the bracket by everything inside so it becomes 2a x 4 + 2a x a Then we use bidmas to get: 8a + 2a^2
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Answered by Tatiana C. • Maths tutor
4418 Views